Abstract: A filter of longitudinal axis Z includes: at least one resonant cavity delimited by walls made of a material that has a non-zero expansion coefficient; a dielectric resonator mounted in the cavity transversally to the axis Z; a mechanical device for compensating at least one resonance frequency of the cavity as a function of the temperature. The compensation device comprises: at least one rotationally mobile finger for each mode and for each cavity, the mobile finger penetrating to a fixed depth into the cavity via a pivot link, and an external mechanical actuator mounted parallel to the axis Z and mechanically coupled to the mobile finger, the external mechanical actuator being made of a material that has a coefficient of thermal expansion at least five times lower than that of the walls of the filter.

Abstract: A compact thermoelastic actuator includes at least two identical force pieces and a securing piece, the securing piece having a coefficient of thermal expansion less than the coefficient of thermal expansion of the force pieces. The force pieces are mounted head-to-tail one beside the other parallel to a longitudinal axis Y and are linearly offset relative to one another, along the longitudinal axis Y. The securing piece has two ends respectively linked to external ends of each force piece and internal ends of each force piece are positioned under a median region of the securing piece. The actuator and device is applicable to waveguides of multiplexers incorporated in space equipment for satellites.

Abstract: The present invention relates to a flexible cap system optimized for thermally-compensated technology microwave resonators. More specifically, this invention proposes a multiple-membrane flexible wall system for thermally-compensated filters and OMUX. The use of a multi-membrane flexible wall, in particular as sealing cap for a resonant cavity of an OMUX channel, makes it possible: to reduce the thermal resistance of the flexible wall, while maintaining an equivalent level of mechanical stresses exerted on said wall for a given displacement; or to reduce the mechanical stresses exerted on the flexible wall for a given displacement, while maintaining one and the same thermal resistance for said wall; or to increase the deformation of the flexible wall by maintaining an equivalent level of mechanical stresses and by maintaining an equivalent thermal resistance.

Abstract: A microwave channel multiplexing device comprises several elementary filters connected in parallel with a common output port by way of a transverse waveguide, each filter comprising a lower end fixed to a support common to all the filters and an upper end away from the support, an external peripheral wall, at least one internal cavity defining an internal channel, a signal input connected to the internal cavity and a signal output connected to the transverse waveguide. The multiplexing device furthermore comprises a conducto-radiative device coupled mechanically and thermally to at least two filters, the conducto-radiative device comprising at least one thermally conducting plate, and linked to the external peripheral walls of each of said at least two filters, the plate being fixed at the level of the upper end of the filters. The invention applies to the field of satellite telecommunications and more particularly to signals repetition devices aboard satellites.

Abstract: A microwave channel multiplexing device comprises several elementary filters connected in parallel with a common output port by way of a transverse waveguide, each filter comprising a lower end fixed to a support common to all the filters and an upper end away from the support, an external peripheral wall, at least one internal cavity defining an internal channel, a signal input connected to the internal cavity and a signal output connected to the transverse waveguide. The multiplexing device furthermore comprises a conducto-radiative device coupled mechanically and thermally to at least two filters, the conducto-radiative device comprising at least one thermally conducting plate, and linked to the external peripheral walls of each of said at least two filters, the plate being fixed at the level of the upper end of the filters. The invention applies to the field of satellite telecommunications and more particularly to signals repetition devices aboard satellites.

Abstract: The present invention relates to a flexible cap system optimized for thermally-compensated technology microwave resonators. More specifically, this invention proposes a multiple-membrane flexible wall system for thermally-compensated filters and OMUX. The use of a multi-membrane flexible wall, in particular as sealing cap for a resonant cavity of an OMUX channel, makes it possible: to reduce the thermal resistance of the flexible wall, while maintaining an equivalent level of mechanical stresses exerted on said wall for a given displacement; or to reduce the mechanical stresses exerted on the flexible wall for a given displacement, while maintaining one and the same thermal resistance for said wall; or to increase the deformation of the flexible wall by maintaining an equivalent level of mechanical stresses and by maintaining an equivalent thermal resistance.

Abstract: The present invention relates to a mechanical compensating device for a waveguide (1). More precisely, the present invention provides a technology for ensuring phase stability in a waveguide (1) subject to expansions and contractions owing to temperature changes. To do this, actuators, which may consist of pairs of prongs (8-9, 10-11), connected to longitudinal ribs (2, 3) cut in the body of the waveguide (1) and integral therewith, cause, because of a large difference between the respective coefficients of thermal expansion of the waveguide (1) and of the actuators, a rotation of the longitudinal ribs (2, 3) about themselves, deforming the short sides (4, 5) of the waveguide (1) when said waveguide (1) expands or contracts according to the changes in temperature.

Abstract: The present invention relates to a mechanical compensating device for a waveguide (1). More precisely, the present invention provides a technology for ensuring phase stability in a waveguide (1) subject to expansions and contractions owing to temperature changes. To do this, actuators, which may consist of pairs of prongs (8-9, 10-11), connected to longitudinal ribs (2, 3) cut in the body of the waveguide (1) and integral therewith, cause, because of a large difference between the respective coefficients of thermal expansion of the waveguide (1) and of the actuators, a rotation of the longitudinal ribs (2, 3) about themselves, deforming the short sides (4, 5) of the waveguide (1) when said waveguide (1) expands or contracts according to the changes in temperature.

Abstract: A device comprises a microwave resonator having at least one cavity having a predefined resonant frequency. The device also comprises a temperature compensation system that is made from a material having a coefficient of thermal expansion that is very low compared to that of the material from which the cavity is made and includes a structure for counteracting the effects of temperature variations on the resonator so that the resonant frequency of the cavity remains within a predetermined range. The device further comprises a temperature compensation adjustment device adapted to modify the volume of the cavity to adjust the value of the resonant frequency to a predefined value.

Abstract: A device comprises a microwave resonator having at least one cavity having a predefined resonant frequency. The device also comprises a temperature compensation system that is made from a material having a coefficient of thermal expansion that is very low compared to that of the material from which the cavity is made and includes a structure for counteracting the effects of temperature variations on the resonator so that the resonant frequency of the cavity remains within a predetermined range. The device further comprises a temperature compensation adjustment device adapted to modify the volume of the cavity to adjust the value of the resonant frequency to a predefined value.